can only use one either keybrd or Mouse

Hi. Ive been using this keyboard and mouse combo for over a year on my laptop. When I moved them and set them back up my keyboard didn't work but my mouse did/checked batteries/tried to re-connect, then I found out that if I connected one before the other the one I connected first would work. I have long since lost the insrtuction manual to this item but under the charger for the mouse it has a diagram that says connect keyboard first then mouse. I'm surre Ive done something like push the wrong button or something when I moved it. Do you have any advice?

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